DIN 743-2:2012-12

A large number of failures in mechanical engineering is due to damage to axles and shafts. The most frequent cause for this is fatigue failure (fatigue fractures, vibration fractures). In addition to the optimum structural design, the calculation of the safety against the occurrence of fatigue failure and damage due to maximum load (permanent deformation, precrack) presents a necessary measure. This standard specifies the size-influencing factors, surface factors, theoretical stress concentration factors and fatigue notch factors required for calculation of the component fatigue strength. This standard has been prepared by Working Committee NA 060-34-32 AA "Wellen und Welle-Nabe-Verbindungen" ("Shafts and shaft to collar connections") at the Technical Section Power transmission engineering of the Mechanical Engineering Standards Committee (NAM) at DIN, the German Institute for Standardization e. V. The DIN 743 standard series - Shafts and axles, calculation of load capacity - consists of - Part 1: General basics; - Part 2: Theoretical stress concentration factors and fatigue notch factors; - Part 3: Strength of material; - Part 4: Fatigue limit, endurance limit - Equivalently damaging continuous stress; - Supplement 1: Examples to Part 1 to 3; - Supplement 2: Examples to Part 4. The following modifications have been made with respect to DIN 743-2:2000-10, a) 5.2: the paragraph with the headline "recess with relief groove" has been revised. Overlapping of two groove shapes (recess, round groove) has been deleted. b) clause 6: the decrease of the technological size-influencing factor for case-hardening steels (except Cr-Ni-Mo case-hardening steels) with increasing diameter d_eff has been limited to D_eff = 150 mm. c) clause 6: The decrease of the technological size-influencing factor for the yield strength of heat-treatable steels has been supplemented. Previous editions: DIN 743-2:2000-10.